Secondary battery and electrolyte solution
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsSatoshi Nishitani, Masaki Deguchi
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Abstract
A secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, and the negative electrode active material includes a first composite material containing a silicate phase and silicon particles dispersed in the silicate phase. The silicate phase includes at least one of an alkali metal and an alkaline earth metal. The content of the silicon particles in the first composite material is 30 mass % or more and 80 mass % or less. The electrolyte includes lithium fluorosulfonate.
Claims13
A secondary battery, comprising:
- a positive electrode;
- a negative electrode;
- and an electrolyte, wherein
- the negative electrode includes a negative electrode active material capable of electrochemically absorbing and releasing lithium ions,
- the negative electrode active material includes a first composite material containing a silicate phase and silicon particles dispersed in the silicate phase,
- the silicate phase includes at least one of an alkali metal and an alkaline earth metal,
- a content of the silicon particles in the first composite material is 30 mass % or more and 80 mass % or less, and
- the electrolyte includes lithium fluorosulfonate.
An electrolyte for use in a secondary battery having a negative electrode including a first composite material containing a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase including at least one of an alkali metal and an alkaline earth metal, the electrolyte including:
- lithium fluorosulfonate in an amount of 0.1 mass % or more and 2 mass % or less.
Dependencies are inferred from the claim text.